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Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
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If your Phone service is recording messages, that disconnects your line. You need to have them turn that feature off, OR set the answering machine to answer is less rings, say two or three. If the FAX machine listens to the line, it can still be set at a higher amount of rings, say four, and should still answer any FAX signal as it's sent to the answering machine.

Distinctive Ring
basicsDistinctive Ring service is an
optional service available from many telephone companies. The
Distinctive Ring service permits you to assign more than one telephone
number to the same telephone line. Distinctive Ring allows you to use a
single phone line for both voice and fax calls. You can assign a unique
phone number and ring pattern for incoming fax calls. When a fax comes
in, each telephone number makes a distinctive ringing sound, such as a
single ring, double ring, or triple ring.
NOTE:
The Distinctive Ring Service
is the name HP and others use to describe this feature. Distinctive Ring
is also known as:

Call Sign

Custom Ring

Ident-a-Call

Ident-a-Ring

Ident-a-Ring

Multi Ring

Personalized
Ringing

Ringmaster

Smart Ring

Teen-Ring

The Distinctive Ring Service allows the HP
product to work similarly to a dedicated fax line.
If you connect an HP fax product and a telephone to one telephone line,
you can assign one telephone number for fax calls and another for voice
calls.
NOTE:
You cannot
send or receive faxes when the phone line is in use. Even if the HP fax
product has a separate telephone number, it is still sharing the same
phone line.
Set the Distinctive Ring
Service Using the menus on the
product control panel, follow these steps to set a distinctive ring
pattern.
Step one: Turn on Auto Answer
Turn on Auto Answer by pressing the Auto Answer
button on the control panel. The button light indicates when Auto
Answer is on.If the button light is
already on, you do not need to press the button.
Step two: Set the distinctive ring patternFollow these steps to change the answer ring
pattern.

Press the Setup
button (
) on the product control panel.

Press the Right Arrow button (
) to select Advanced Fax Setup
, and then press the OK
button.

Press the Right
Arrow button (
) to select Distinctive Ring
, and then press the OK
button.

Press the Right
Arrow button (
) to select one of the following options:

All Rings

Single Rings

Double Rings

Triple
Rings

Double & Triple
Rings

Press
the OK
button to select the option.

Press the Back button (
) to return to the main menu.

Now if you have anymore problems copy the link from below and paste it in your address bar and it will help you further with a document. Follow all the settings in the document and your fax should be setup,keep in MIND THAT THE RINGS TO ANSWER SHOULD BE 2,SO YOU CAN RECEIVE FAXES AFTER TWO RINGS

For a phone line dedicated only to the fax machine, the process is as follows:

Press Menu/Set, 0, 1.

You will see the Fax Receive window

Use UP and DOWN arrows to change the setting to FAX ONLY

Press Menu/Set.

Press STOP/EXIT

Your fax machine will now answer every incoming call. If the fax machine is sharing the phone line with a telephone, repeat the above steps and change from FAX ONLY to FAX/TEL This option will allow you to share the line with a phone only, not an answering machine. Once in FAX/TEL mode, the fax machine will still grab every incoming FAX call, and give a special ring (slightly different than a regular telephone ring) when it's a regular incoming phone call signaling you to answer the phone. I hope this helps with your problem. Best of luck!Greg

hi
you really have a very good choice of printers
is one of the best printers from hp
inorder to set fax on ur printer you should first be sure what type of telephone line you are using
there are 2 type of line 1 dedicated -> that is directly attached for fax and has no other telephone or TAM connected
if you have this line you can directly attach the phone line on the printer line 1
the other type of line is shared that means you use the same line for phone and fax
in this the connection should be as :- telephone line from wall jack to the printer line 1
then from printer ext port to telephone answering machine (if any ) then from answering machine to telephone
(if u have a dsl line that means u use phone and internet from the telephone line then there will be 2 lines comming out of the splitter 1 to router and other to telephone here follow the shared line connection mentioned above using the line that goes to the telephone )
now power on the printer and press the setup button (menu) now navigate to basic fax set up press ok and then go to rings to answer it should be 4 rings
now go back and go to advance fax setting and then to distintive ring (DRP) select all rings
and press ok
now run fax test if it passes
then ur fax is set up
try sending fax now
hope this will help you

There are situations when fax interrupts the telephone conversation. The possible cause of this issue is Remote RX feature on MP 780. There are 3 possible solutions to these problems which are listed below:

I) Change Remote RX ID on MP780

Confirm the <Fax> button light is lit. If the light is not lit, press the <Fax> button.

Press <Menu> button. [RECEIVE MODE] will appear on the display.

Press < (left arrow) or > (right arrow) to select [RX SETTINGS].

Press <OK>. [ECM RX] will appear.

Press the < (left arrow) or > (right arrow) to select [REMOTE RX].

Press <OK> twice. The current Remote RX ID number will appear.

Press < or > to select the desired Remote RX ID number. The options are from 00 to 99.

Alternatively, you can press the numeric keypad to select the number.

For example, to select [38], press <3> and then press <8>.

Press <OK>.

Press <Stop/Reset> to return to standby mode (date and receive mode will appear).

II) Turn off Remote RX on MP780

Confirm the <Fax> button light is lit. If the light is not lit, press the <Fax> button.

Press <Menu> button. [RECEIVE MODE] will appear on the display.

Press < (left arrow) or > (right arrow) to select [RX SETTINGS].

Press <OK>. [ECM RX] will appear.

Press the < (left arrow) or > (right arrow) to select [REMOTE RX].

Press <OK>. The current Remote RX option [ON] will appear.

Press < or > to select [OFF].

Press <OK>.

Press <Stop/Reset> to return to standby mode (date and receive mode will appear).

III) Choosing a receive mode MP780
If you want to receive only faxes automatically with your machine, or you have a dedicated telephone line for fax use only:

Select [FAX ONLY MODE].

When you receive a fax call: The machine will receive the fax automatically.When you receive a voice call: You will not be able to answer the call.

If you receive mainly voice calls and sometimes faxes, or you want to receive faxes manually:

Select [MANUAL MODE].

When you receive a fax call: The telephone will ring. Pick up the handset and if you hear a beep, press <Black> or <Color> on the machine to receive the fax.When you receive a voice call: The telephone will ring. Pick up the handset to answer the call.For remote receiving: If you are far from your machine, dial 25 (the remote receiving ID) on your telephone to receive faxes. (Telephone being used, such as a base station for a cordless phone, must be connected through the MP780 for the remote receiving function to work.)

If you want to receive voice messages on your answering machine and receive faxes automatically:

Select [ANS.MACHINE MODE].

When you receive a fax call: First the answering machine connected to your MP780 will respond to an incoming call, and then the MP780 will receive faxes automatically.When you receive a voice call: The answering machine connected to your MP780 will respond to an incoming call.

If you want to receive faxes automatically as well as voice calls:

Select [FAX/TEL AUTO SW].

When you receive a fax call: The machine will receive the fax automatically.When you receive a voice call: The machine will ring. Pick up the handset to answer the call.

If you have subscribed to a Distinctive Ring Pattern Detection (DRPD) Service with your telephone company (US only):

Select [DRPD].

When you receive a fax call: The machine will ring according to the ring pattern you have chosen and receive the fax automatically.When you receive a voice call: The machine will ring according to the ring pattern you have chosen. Pick up the handset to answer the call.

Receive Mode Settings
Select from the following receive mode options to suit your needs. Once you've decided on which receive mode to use, follow the below instructions to set the receive mode using the operation panel.
Receive Mode Setting

Press the <FAX> button to enter Fax mode.

Press <Menu>.

Press the right or left arrow button to select [Receive mode settings], then press the <OK> button.

Types of receive mode
Select the receive mode according to your needs.Receive modePurposeFAX/TEL AUTO SW
When you want to receive faxes automatically as well as voice calls.
FAX ONLY MODE
When you want to receive only faxes automatically with your machine, or have a dedicated telephone line for FAX use only.
DRPD
When you have subscribed to a DRPD service with your telephone company.
MANUAL MODE
When you receive mainly voice calls and sometimes faxes, or want to receive faxes manually.
ANS.MACHINE MODE
When you want to receive voice messages on your answering machine and receive faxes automatically.
FAX/TEL auto switch
FAX
:
The machine does not ring but will receive the fax automatically.
Voice call
:
The phone attached to the machine will ring. Pick up the handset to answer the call.
Note:

Ring start timing and Telephone ring length can be specified in FAX/TEL auto switch in the Receive mode settings.

If you want the telephone to ring when it receives a fax, connect a telephone to your machine and enable the Incoming ring settings in RX settings.

The phone attached to the machine may not ring depending on the telephone type you are using.

FAX only
FAX *
:
The telephone does not ring. The machine will receive the fax automatically.
Voice call
:
You will not be able to answer the call.
* If you want the telephone to ring, connect the telephone to your machine and enable the Incoming ring settings in RX settings menu.

DRPD
FAX
:
Your telephone line will ring according to the ring pattern you have chosen and receive the fax automatically.
Voice call
:
Your telephone line will ring according to the ring pattern you have chosen. Pick up the handset to answer the call.
Note: Specify the FAX pattern in the DRPD: Set FAX ring pat. in RX settings menu.

Manual RX
FAX
:
The
telephone attached to the machine will ring. Pick up the handset and if
you hear a beep tone, press the <Color> or <Black> button
on the machine to receive the fax.
Voice call
:
The telephone attached to the machine will ring. Pick up the handset to answer the call.
Note:
If you are far from your machine, you can use the remote receiving
function to receive faxes. Pick up the handset of the telephone
connected to the machine and press 25 (the remote receiving ID).

Ans. machine connect
FAX
:
First
the answering machine connected to your machine will respond to an
incoming call, and then the machine will receive faxes automatically.
Voice call
:
The answering machine connected to your machine will respond to an incoming call.
Note:

How to Set the Receive Mode (MF4140/MF4150)
1. Press [Additional Functions].
2. Use [Left cursor] or [Right cursor] to select [FAX SETTINGS], then press [OK].
3. Use [Left cursor] or [Right cursor] to select [RX SETTINGS], then press [OK].
4. Use [Left cursor] or [Right cursor] to select [RX MODE], then press [OK].
5. Use [Left cursor] or [Right cursor] to select the receive mode, then press [OK].
[FaxOnly]: Answers all calls as faxes and disconnects voice calls.
[AnsMode]: Receives faxes automatically and records voice messages.
[NET SWITCH]: Distinguishes between fax and voice calls.
[FaxTel]: Switches between fax and voice calls automatically.
[MANUAL]: Does not answer any calls. You have to manually receive faxes.
NOTE:
a. For [FaxTel] or [MANUAL], make sure the optional handset or an external telephone is connected to the machine.
b. For [AnsMode], make sure an answering machine is connected to the machine.
c. The [NET SWITCH] mode is available for certain countries only and requires subscription to a network switch service.
6. Press [Stop/Reset] to return to the standby mode.

Link
Receiving a fax
You can choose to receive a fax automatically, manually, or through an answering machine.
Note: For your All-In-One to receive a color fax, the machine from which you are receiving must also support color faxes.
Automatically
Recommended for a dedicated fax line
Your All-In-One automatically accepts incoming faxes using the
automatic answering mode. When the Auto Answer light is on, the
All-In-One receives a fax after the specified number of rings set in
the Options menu.
To set a number of rings for the automatic answering mode:

On the control panel, press Mode repeatedly until Fax is selected.

Press Optionsuntil ANSWER FAX WHEN appears.

Press + to choose After 1 ring, After 2 rings, After 3 rings (default), or After 5 rings.

Press Select.

Make sure the Auto Answer light on the All-In-One is on.

When the number of rings that you set is detected, the All-In-One automatically receives your fax.
Manually
Recommended for a shared fax and telephone line
You can choose which incoming faxes to accept by setting your All-In-One to manual answering mode.

Make sure the All-In-One Auto Answer light is off.

Press *9* on the telephone after you answer the telephone and hear fax tones.

Hang up the telephone.

The All-In-One receives your fax.
Answering machine
Recommended for a shared fax and telephone line
To receive a fax with an answering machine
connected to your All-In-One, set the answering machine to answer
incoming calls before the All-In-One does. For example, if you set the
answering machine to answer calls after 3 rings, set the All-In-One to
answer calls after 5 rings.

On the control panel, press Mode repeatedly until Fax is selected.

Press Options until ANSWER FAX WHEN appears.

Press+ until After 5 rings appears.

PressSelect.

Make sure the Auto Answer light on the All-In-One is on.

When a ring is detected, the answering machine picks up the call.

If a fax is detected, the All-In-One receives the fax and disconnects the answering machine.

If not, the answering machine completes the call.

Note: You must set up the equipment as shown in connecting to an answering machine.

Its called distintive Ring. This is the instructions from the manual -

VERY IMPORTANT
If you have Voice Mail or a TAD (Telephone Answering Device) and want to keep
one of your phone numbers dedicated only to fax calls, you must leave the fax machine
in MANUAL mode at all times while using the distinctive ring feature. Here’s why:
Manual mode will never pick up a call by itself, since it is «Neutral ». When the fax
machine is in this « neutral » mode, the Distinctive Ring Feature can be activated. The
distinctive ring feature is actually an answering mode. So, do not activate FAX ONLY
mode or FAX /TEL mode while using distinctive ring; otherwise, the fax machine will
answer calls for all the numbers.
Registering the Distinctive Ring Pattern
1 Set the fax machine to MANUAL mode.
2 Press Menu/Set, 0, 1.
3 Press to select DISTINCTIVE:SET?, and then press Menu/Set.
4 Press to select the prestored ring pattern you want to assign, and then press
Menu/Set. (You will hear each pattern as you scroll through the four patterns.)
Be sure to choose the pattern assigned by the Telephone Company.
5 Press Stop/Exit.